Visible and infrared spectra of matrix-isolated perylene cations

✍ Scribed by Jan Szczepanski; Chris Chapo; Martin Vala

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 487 KB
• Volume: 205
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)87147-u

✦ Synopsis

Perylene radical cations have been produced via low-energy electron impact of a vapor phase mixture of perylene, argon and carbon tetrachloride. The cations have been trapped and stabilized in an argon matrix at 12 Kin sufficient quantities to observe their infrared (and visible) absorption spectra. A strong green (534 nm) electronic absorption band, previously produced by yirradiation of perylene in an s-butylchloride matrix (77 K), has been ascribed to the perylene cation. A positive correlation has beenfoundktween this band andthe newly observed infrared bands at 1128,1318, 1346,1349, and 1551 cm-l. The integrated intensities of these and other bands, assigned to the pcrylene cation, have been measured and are discussed in light of the recent suggestion that polycyclic aromatic hydrocarbons arc the carriers of the unidentified infrared emission bands observed from interstellar space.